Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019
Other Liabilities Disclosure [Abstract]
Accrued compensations and benefits	$ 35,775		$ 50,246
Customer deposits	27,316		18,937
Accrued interest	23,539		23,870
Warranty reserve	12,421	$ 12,616	13,052	$ 12,058	$ 12,646	$ 13,388
Litigation accruals	4,169		4,981
Income tax liabilities	717		584
Other	29,631		24,313
Total	$ 133,568		$ 135,983